[单选题]
The pendulum of a grandfather clock is 1.0 m long. What is its*b3d, :r 0pa9w4ic0eivb ww nu periosw +3b,6 lqslqn7 y1tad on the Moon where the acceleration due to gravitysqs3+1ln l,7b6 qaw ty is only $1.7 \; m/s^2$?
A. $1.2 \; s$
B. $2.4 \; s$
C. $4.8 \; s$
D. $23 \; s$
